Acquisition (SCADA) computer with a single RS-232 line or USB link, either locally at the
substation or remotely through a telephone line and modem.
2.2 Components of the Hydran 201i System
2.2.1 Hydran 201Ti Intelligent Transmitter
The Hydran 201Ti Intelligent Transmitter (Figure 2-1 below) is the foundation upon
which the Hydran 201i System is built. It consists of a small cylindrical enclosure which
attaches directly to a transformer valve using a brass adaptor. This enclosure contains a
standard Hydran sensor, a thermal conditioning system and a microprocessor-based
intelligent electronic transmitter.
Figure 2-1: Hydran 201Ti Intelligent Transmitter
Terminal blocks are provided for easy connection of: AC power; alarm contacts (Gas
High, Gas High- High and System Fail); supervisory link; and one isolated, analog 4–20
mA output. A USB type B connector is provided for local computer interface.
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